babel-plugin-styled-components/lib/utils/hash.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
/**
 * JS Implementation of MurmurHash2
 *
 * @author <a href="mailto:gary.court@gmail.com">Gary Court</a>
 * @see http://github.com/garycourt/murmurhash-js
 * @author <a href="mailto:aappleby@gmail.com">Austin Appleby</a>
 * @see http://sites.google.com/site/murmurhash/
 *
 * @param {string} str ASCII only
 * @return {string} Base 36 encoded hash result
 */
function murmurhash2_32_gc(str) {
  var l = str.length;
  var h = l;
  var i = 0;
  var k = void 0;

  while (l >= 4) {
    k = str.charCodeAt(i) & 0xff | (str.charCodeAt(++i) & 0xff) << 8 | (str.charCodeAt(++i) & 0xff) << 16 | (str.charCodeAt(++i) & 0xff) << 24;

    k = (k & 0xffff) * 0x5bd1e995 + (((k >>> 16) * 0x5bd1e995 & 0xffff) << 16);
    k ^= k >>> 24;
    k = (k & 0xffff) * 0x5bd1e995 + (((k >>> 16) * 0x5bd1e995 & 0xffff) << 16);

    h = (h & 0xffff) * 0x5bd1e995 + (((h >>> 16) * 0x5bd1e995 & 0xffff) << 16) ^ k;

    l -= 4;
    ++i;
  } // forgive existing code

  /* eslint-disable no-fallthrough */switch (l) {
    case 3:
      h ^= (str.charCodeAt(i + 2) & 0xff) << 16;
    case 2:
      h ^= (str.charCodeAt(i + 1) & 0xff) << 8;
    case 1:
      h ^= str.charCodeAt(i) & 0xff;
      h = (h & 0xffff) * 0x5bd1e995 + (((h >>> 16) * 0x5bd1e995 & 0xffff) << 16);
  }
  /* eslint-enable no-fallthrough */

  h ^= h >>> 13;
  h = (h & 0xffff) * 0x5bd1e995 + (((h >>> 16) * 0x5bd1e995 & 0xffff) << 16);
  h ^= h >>> 15;

  return (h >>> 0).toString(36);
}

exports.default = murmurhash2_32_gc;